Methods and apparatus for generating a sinusoidal motor drive signal for a MEMS gyroscope

摘要

An apparatus is described which reduces a time delay and a resultant phase shift in a gyroscope motor drive signal. The motor drive signal originates from a numerically controlled oscillator whose output is sampled at a predetermined rate. The apparatus includes a first element which upsamples the oscillator output signal samples and a band pass filter configured to receive an output from the first element and remove spectral components from the output of the first element. The apparatus further includes a third element which generates a tuning parameter, beta'_o, for tuning of the band pass filter and a scaling multiplier configured to normalize an output of the filter.